KROHNE OPTISWITCH 3300C Relay EN - Manual (Page 8)

It is designed for industrial use in all areas of process
technology and is preferably used for bulk solids.
Typical applications are overfill and dry run protection. Thanks
to its simple and robust measuring system, OPTISWITCH
3300 C is virtually unaffected by the chemical and physical
properties of the bulk solid.
It functions even when exposed to strong external vibration or
changing products.
Solid detection in water
If OPTISWITCH 3300 C was ordered for detection of solids in
water, the tuning fork is adjusted to the density of water. In the
air or when covered by water (density: 1 g/cm³/0.036 lbs/in)
OPTISWITCH 3300 C signals "uncovered". Only if the
vibrating element is also covered with solids (e.g. sand,
sludge, gravel etc.) will the sensor signal "covered".
Fault monitoring
The electronics of OPTISWITCH 3300 C continuously mon-
itors the following criteria:
l
Correct vibrating frequency
l
Line break to the piezo drive
If one of the stated malfunctions is detected or in case of
power failure, the electronics takes on a defined switching
condition, i.e. the relay deenergises (safe condition).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 150 Hz. When the
tuning fork is submerged in the product, the vibration
amplitude changes. This change is detected by the integrated
oscillator and converted into a switching command.
OPTISWITCH 3300 C is a compact instrument, i.e. it can be
operated without external evaluation system. The integrated
electronics evaluates the level signal and outputs a switching
signal. With this switching signal, a connected device can be
directly activated (e.g. a warning system, a PLC, a pump etc.).
The exact range of the power supply is stated in the "Technical
data" in the "Supplement".
Physical principle
Power supply
8 OPTISWITCH 3300 C - with relay output
Product description
29961
-EN
-060830